html {
    height: 100%;
    box-sizing: border-box;
  }

body {
    height: 100%;
    -moz-osx-font-smoothing: grayscale;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    font-family: Helvetica Neue, Helvetica, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Arial, sans-serif;
  }

  #app{
    height: 100%;
  }

  .clearfix::after{
        content: "";
        display: block;
        font-size: 0;
        clear:both;
  } 